Add Luogu Online IDE

Hello! Can you add [Luogu Online IDE](https://www.luogu.org/ide)? :heart:

It can run the following languages: 

```
Pascal
C
C++
C++11
C++14
C++17
Python 2
Python 3
PyPy 2
PyPy 3
Java 8
Node.js
Ruby
Go
Rust
PHP 7
C# Mono
Visual Basic Mono
Haskell
Kotlin/Native
Kotlin/JVM
Scala
Perl
```